House of Commons
During a Queen's Speech debate, the Leader of the Opposition, William Hague, taunted Prime Minister Tony Blair over the possibility that Ken Livingstone could become mayor of London.
Mr Blair was vehemently opposed to Mr Livingstone's mayoral candidacy and made no secret of it, declaring that Mr Livingstone would be "a disaster" for London.
Mr Livingstone stood, and won, as an independent mayoral candidate after he failed to be selected as Labour's candidate, reneging on an earlier pledge that he would not do so.
Consequently, the whip was removed from Mr Livingstone after his election although he was later reinstated in 2004.